turbo combo questions

[psycho6cyl]

From time to time I use my brain and cause more mess than anything. My question is, runni.ng a 6466 w iron heads worth it? Figure rest of combo is right convert and off the shelf cam.. just curious/bench racing.. thx

 

[84BuickGNYorkPA]

Bison will step in, but from my own personal experience, I have not maxed my 6262 journal bearing out at 127.78 mph in the 1/4 mile, not sure what your goal is but I have minimum lag and lot's of wheel spin on the street (if I'm in the mood to give it some gas). The 6466 may be a better turbo for your goal, I don't know, just telling you what I have found with the little 6262.

Chuck

 

[bison]

From time to time I use my brain and cause more mess than anything. My question is, runni.ng a 6466 w iron heads worth it? Figure rest of combo is right convert and off the shelf cam.. just curious/bench racing.. thx

If very low 10's or better is your goal. Takes a lot of engine to swallow what it can provide and I've yet to see a Buick run one out. Typical off the shelf cam 9:1 iron head dialed in combo will trap 136-137mph with boost around 30psi. The turbo is good way beyond that. With really good heads and valve train and a few other tricks id expect 145mph.


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[psycho6cyl]

Thx for info chuck. Ive talked w bison and I know his 6262 is killer. Im.planning on.pulling the trigger soon. Just want to make sure the direction.im.headed is the way I.want to go. For some.reason that 6466 is so dam.pretty but the price tag is not worth it for what I might possibly do..

Thx for replies guys

 

[Mr.Spool]

i run the 64/68 on a good motor with iron heads.it makes more than enough power to break lots of parts.ive tuned the car up to 30psi so far and really like the turbo.for a street car though the smaller ex wheel will be the wiser choice.

 

[we4Mateo]

...Takes a lot of engine to swallow what it can provide and I've yet to see a Buick run one out...


Posted from the TurboBuick.Com mobile app

What is the disadvantage of not running a turbo all out? I'm close on my TE44 but would like a little more room to go. On the next build, I'm thinking 6466, but would go smaller if there is some advantage to running a 6262 all out vs a 6466 below it's maximum potential. Does this make sense? Sorry if my wording is poor. I'd just like room to grow instead of being held to 130mph or so in a heavy car with a 6262 even though I really don't need to go faster than that; I just want the option but not if it ruins the car running a 6466 at say 20psi or 22psi or whatever.

 

[bison]

What is the disadvantage of not running a turbo all out? I'm close on my TE44 but would like a little more room to go. On the next build, I'm thinking 6466, but would go smaller if there is some advantage to running a 6262 all out vs a 6466 below it's maximum potential. Does this make sense? Sorry if my wording is poor. I'd just like room to grow instead of being held to 130mph or so in a heavy car with a 6262 even though I really don't need to go faster than that; I just want the option but not if it ruins the car running a 6466 at say 20psi or 22psi or whatever.

The disadvantage from a performance standpoint is that spool is slower, you will need to wastegate a huge % of ex energy to control boost,-- and you probably won't be in the meet of the efficiency island even though we don't know for sure what they are. You need to rethink the wastegate strategy and the torque converter/cam if going from 20-30psi on a given combo. If the converter is right at 20 it's too loose at 30. The cars are more fun to drive when the turbo is run harder. Are you going to spread the lobes to deal with backpressure with a smaller turbine or are you going to keep them tight to enhance spool up with a larger turbine only to hit a back pressure problem under normal operating conditions when you turn it up.? Those are the things I ask myself.


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[we4Mateo]

The disadvantage from a performance standpoint is that spool is slower, you will need to wastegate a huge % of ex energy to control boost,-- and you probably won't be in the meet of the efficiency island even though we don't know for sure what they are. You need to rethink the wastegate strategy and the torque converter/cam if going from 20-30psi on a given combo. If the converter is right at 20 it's too loose at 30. The cars are more fun to drive when the turbo is run harder. Are you going to spread the lobes to deal with backpressure with a smaller turbine or are you going to keep them tight to enhance spool up with a larger turbine only to hit a back pressure problem under normal operating conditions when you turn it up.? Those are the things I ask myself.


Posted from the TurboBuick.Com mobile app

Just when I think I start to have it figured out... Thank you very much for the info. See the problem lies in that I want it all. I totally see what you're saying though. After I got my tune right at 25+psi, I seldomly run it below that b/c it just doesn't feel right. I want the new combo to run right at 20psi and 30+psi, but I think the TC will be my big problem there as well as the wastegating of enough energy to keep it at 20psi and still control it or make 30+psi with such a big ported wastegate hole. Oh yeah, I'm staying internal gate too, so that question of controlling a 6466 internally is an issue in and of itself.

Thanks again.

 

[bison]

Just when I think I start to have it figured out... Thank you very much for the info. See the problem lies in that I want it all. I totally see what you're saying though. After I got my tune right at 25+psi, I seldomly run it below that b/c it just doesn't feel right. I want the new combo to run right at 20psi and 30+psi, but I think the TC will be my big problem there as well as the wastegating of enough energy to keep it at 20psi and still control it or make 30+psi with such a big ported wastegate hole. Oh yeah, I'm staying internal gate too, so that question of controlling a 6466 internally is an issue in and of itself.

Thanks again.

It depends on the engines air flow. If you built an engine that made peak power around 6500 then you probably could get away running 20psi because the mass flow at higher rpm will be a lot closer to what the turbo wants to move. The converter would need to be a lot looser and you won't have the same kind of build that you typically see around here.


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[qws2000]

I have the 6466 on my current motor and seems like it wants more air... The 315 FMIC has helped a lot... Brian, has designed my entire motor (new Stroker) Cam, Heads, Valve train... I wonder if I should have went with a external wastegate, and aluminum Heads... I have in the box a 5 inch RJC D/P it has a huge internal wastegate. Big enough??

 

[we4Mateo]

I have the 6466 on my current motor and seems like it wants more air... The 315 FMIC has helped a lot... Brian, has designed my entire motor (new Stroker) Cam, Heads, Valve train... I wonder if I should have went with a external wastegate, and aluminum Heads... I have in the box a 5 inch RJC D/P it has a huge internal wastegate. Big enough??

How fast is it? And I think that downpipe would have a large enough wastegate hole, but I wouldn't know.

 

[turbojoe1]

I have the 6466 on my current motor and seems like it wants more air... The 315 FMIC has helped a lot... Brian, has designed my entire motor (new Stroker) Cam, Heads, Valve train... I wonder if I should have went with a external wastegate, and aluminum Heads... I have in the box a 5 inch RJC D/P it has a huge internal wastegate. Big enough??

Holy crap, any pics yet?